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7+9d=7+3
We move all terms to the left:
7+9d-(7+3)=0
We add all the numbers together, and all the variables
9d+7-10=0
We add all the numbers together, and all the variables
9d-3=0
We move all terms containing d to the left, all other terms to the right
9d=3
d=3/9
d=1/3
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